Wideband antenna

Abstract

A wideband antenna has: a rectangular conductor sheet; a bow-tie-shaped slit formed in the rectangular conductor sheet, the rectangular conductor sheet having two apex portions defined by the bow-tie-shaped slit, the two apex portions being opposite to each other in the middle of the bow-tie-shaped slit; an auxiliary antenna element formed to extend along the bow-tie-shaped slit on both sides of one of the two apex portions; a power-feeding portion formed at the one of the two apex portions; and a grounding portion formed at an other of the two apex portions.

1. A wideband antenna, comprising:
 a rectangular conductor sheet; 
 an odd-shaped slit with a laterally elongated rhombic or tapered shape formed in the rectangular conductor sheet so that a notch slit is formed to extend from side-corner portions of the odd-shaped slit toward the long sides of the rectangular conductor sheet; 
 an auxiliary antenna element formed to extend from one side-corner portion of the side-corner portions into the odd-shaped slit; 
 a power-feeding portion formed at a base of the auxiliary antenna element; and 
 a grounding portion formed in the other side-corner portion of the mutually opposite side-corner portions of the notch slit. 
 
   
   
     2. The wideband antenna according to  claim 1 , wherein:
 the odd-shaped slit with a laterally elongated rhombic or tapered shape is formed to be positioned on the upper side of the rectangular conductor sheet, and a grounding portion is formed on the lower side of the rectangular conductor sheet to the odd-shaped slit. 
 
   
   
     3. The wideband antenna according to  claim 1 , wherein:
 the power-feeding portion is electrically connected to the rectangular conductor sheet. 
 
   
   
     4. The wideband antenna according to  claim 1 , wherein:
 the power-feeding portion is formed at the one side-corner portion. 
 
   
   
     5. The wideband antenna according to  claim 1 , wherein the auxiliary antenna element has a rectangular shape.